...early morning.... coffee just starting to kick in... I see the words, and individually they make sense, but not really in that order.
MxusMick said:
Hello everyone, I am thinking about adding an extra hoverboard motor (friction drive) to my functioning ebike ...
OK - fair enough.
... to pump extra voltage to the controller when riding.
Well, the motor won't 'pump extra voltage TO your controller' - unless you somehow set it up as a generator... but then you have your original motor driving this motor - as mentioned above, that sounds like 'perpetual motion'. No good here.
My bike has a 36v lithium battery 10ah, with a 1000w brushless hub motor and an oversize contoller (48-60v).
OK
I am hoping to use the hoverboard motor with a 3 phase bridge rectifier to increase voltage and improve speed, adding to the 36v battery supply.
Sort of falls apart here again. Sounds like you plan to be using the hoverboard motor as a generator? ...and rectify the output? Again - no good. This is 'perpetual motion' if you plan to use one motor to drive another as a generator.
Any help appreciated, Mick.
Yes, abandon this plan while you're ahead and re-read the three rules of thermodynamics... 1) You can't come out ahead 2) You can't break even 3) You can't not play the game
I'm also not completely sure about 'adding another battery pack in series' - that would be 2x 36V, which would get you up to 72V. This is FAR excess of the motor rating (assuming it also matches the battery rating) and also 12V above the controller rating, so that might tend to let magic smoke out of the system pretty quick. You could possibly swap out the 36V battery for a 48V version which may give some modest gains, assuming the motor can handle it. If the motor is rated closer to the controller, (60V) you could also look to increase the battery to that point - again, provided all other components can handle it.
But at any rate, the voltage increase needs to come from extra battery, not hooking a motor to act as a generator to feed back to the motor.